# Source: http://sources.redhat.com/ml/crossgcc/2004-02/msg00104.html # # From: Dan Kegel # To: Nicolas Pitre # Cc: add , Richard dot Earnshaw at arm dot com, # rearnsha at arm dot com, crossgcc at sources dot redhat dot com, # linux-arm at lists dot arm dot linux dot org dot uk # Date: Mon, 16 Feb 2004 22:49:35 -0800 # Subject: Re: problem while building arm vfp softfloat gcc # # Attached is a patch from addsub@eyou.com that he says patches glibc and # makes printf("%f", 1.0) work again. I haven't tested it, just wanted # to give Nico a chance to have a look at it. Not sure if addsub wrote # this himself or whether it's suitable for glibc mainline (I've asked him). # - Dan diff -uNrp glibc.old/sysdeps/arm/bits/endian.h glibc.new/sysdeps/arm/bits/endian.h --- glibc.old/sysdeps/arm/bits/endian.h 1999-04-12 11:59:13.000000000 -0400 +++ glibc.new/sysdeps/arm/bits/endian.h 2004-02-12 09:15:13.000000000 -0500 @@ -9,4 +9,9 @@ #else #define __BYTE_ORDER __LITTLE_ENDIAN #endif + +#ifdef __VFP_FP__ +#define __FLOAT_WORD_ORDER __BYTE_ORDER +#else #define __FLOAT_WORD_ORDER __BIG_ENDIAN +#endif diff -uNrp glibc.old/sysdeps/arm/gmp-mparam.h glibc.new/sysdeps/arm/gmp-mparam.h --- glibc.old/sysdeps/arm/gmp-mparam.h 2001-07-07 15:21:19.000000000 -0400 +++ glibc.new/sysdeps/arm/gmp-mparam.h 2004-02-12 09:15:13.000000000 -0500 @@ -26,5 +26,13 @@ MA 02111-1307, USA. */ #define BITS_PER_SHORTINT 16 #define BITS_PER_CHAR 8 -#define IEEE_DOUBLE_BIG_ENDIAN 0 -#define IEEE_DOUBLE_MIXED_ENDIAN 1 +#if defined(__ARMEB__) +# define IEEE_DOUBLE_MIXED_ENDIAN 0 +# define IEEE_DOUBLE_BIG_ENDIAN 1 +#elif defined(__VFP_FP__) +# define IEEE_DOUBLE_MIXED_ENDIAN 0 +# define IEEE_DOUBLE_BIG_ENDIAN 0 +#else +# define IEEE_DOUBLE_BIG_ENDIAN 0 +# define IEEE_DOUBLE_MIXED_ENDIAN 1 +#endif diff -uNrp glibc.old/sysdeps/arm/ieee754.h glibc.new/sysdeps/arm/ieee754.h --- glibc.old/sysdeps/arm/ieee754.h 2001-07-07 15:21:19.000000000 -0400 +++ glibc.new/sysdeps/arm/ieee754.h 1969-12-31 19:00:00.000000000 -0500 @@ -1,115 +0,0 @@ -/* Copyright (C) 1992, 1995, 1996, 1998 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef _IEEE754_H - -#define _IEEE754_H 1 -#include - -#include - -__BEGIN_DECLS - -union ieee754_float - { - float f; - - /* This is the IEEE 754 single-precision format. */ - struct - { - unsigned int mantissa:23; - unsigned int exponent:8; - unsigned int negative:1; - } ieee; - - /* This format makes it easier to see if a NaN is a signalling NaN. */ - struct - { - unsigned int mantissa:22; - unsigned int quiet_nan:1; - unsigned int exponent:8; - unsigned int negative:1; - } ieee_nan; - }; - -#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */ - - -union ieee754_double - { - double d; - - /* This is the IEEE 754 double-precision format. */ - struct - { - unsigned int mantissa0:20; - unsigned int exponent:11; - unsigned int negative:1; - unsigned int mantissa1:32; - } ieee; - - /* This format makes it easier to see if a NaN is a signalling NaN. */ - struct - { - unsigned int mantissa0:19; - unsigned int quiet_nan:1; - unsigned int exponent:11; - unsigned int negative:1; - unsigned int mantissa1:32; - } ieee_nan; - }; - -#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */ - - -/* The following two structures are correct for `new' floating point systems but - wrong for the old FPPC. The only solution seems to be to avoid their use on - old hardware. */ - -union ieee854_long_double - { - long double d; - - /* This is the IEEE 854 double-extended-precision format. */ - struct - { - unsigned int exponent:15; - unsigned int empty:16; - unsigned int negative:1; - unsigned int mantissa1:32; - unsigned int mantissa0:32; - } ieee; - - /* This is for NaNs in the IEEE 854 double-extended-precision format. */ - struct - { - unsigned int exponent:15; - unsigned int empty:16; - unsigned int negative:1; - unsigned int mantissa1:32; - unsigned int mantissa0:30; - unsigned int quiet_nan:1; - unsigned int one:1; - } ieee_nan; - }; - -#define IEEE854_LONG_DOUBLE_BIAS 0x3fff - -__END_DECLS - -#endif /* ieee754.h */